# !/usr/bin/python
# -*- coding:utf8 -*-

from bs4 import BeautifulSoup
import re
import urlparse

class HtmlParser(object):

    # 私有方法 获取爬虫获得到的url
    def _get_new_urls(self, page_url, soup):
        new_urls = set()
        links = soup.find_all('a', href=re.compile(r"/item/(.*)"))
        for link in links:
            new_url = link['href']
            new_full_url = urlparse.urljoin(page_url, new_url)
            new_urls.add(new_full_url)
        return new_urls

    # 私有方法 获取爬虫获取到的数据
    def _get_new_data(self, page_url, soup):

        # 添加字典
        res_data = {}

        # 设置key-value for url
        res_data['url'] = page_url
        # 设置key-value for title
        title_node = soup.find('dd', class_="lemmaWgt-lemmaTitle-title") .find("h1")
        if title_node is None:
            return
        res_data['title'] = title_node.get_text()
        # 设置key-value for summary
        summary_node = soup.find('div', class_="lemma-summary")
        if summary_node is None:
            return
        res_data['summary'] = summary_node.get_text()

        return res_data

    def parse(self, page_url, html_content):

        if page_url is None or html_content is None:
            return
        soup = BeautifulSoup(html_content, 'html.parser', from_encoding='utf-8')
        new_urls = self._get_new_urls(page_url, soup)
        new_data = self._get_new_data(page_url, soup)
        return new_urls, new_data
